Official 1981-2010 Climate Normals City: SULLIVAN 3S State: IL ID: 118389 Latitude: 39.5608 Longitude: -88.6067 Elevation: 659.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 34.5 39.0 50.2 63.4 72.7 82.5 85.2 84.7 77.3 66.0 51.3 38.5 Mean: 26.2 29.9 40.4 51.9 62.1 71.9 75.0 72.9 64.9 54.2 41.8 30.5 Low: 17.9 20.9 30.6 40.4 51.5 61.3 64.8 61.1 52.5 42.4 32.4 22.5 CDD: 0 0 1 10 66 222 311 252 86 18 1 0 HDD: 1203 981 763 403 156 15 2 7 89 353 695 1069 Number of Days T090: 0.0 0.0 0.0 0.0 0.3 2.8 5.1 6.0 1.3 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 T000: 2.6 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.4 T032: 27.7 24.2 18.6 6.8 0.3 0.0 0.0 0.0 0.1 4.0 16.0 26.3 ------------------------------------------------------------------------------------------ Annual Values High Temp: 62.2 F Mean Temp: 51.9 F Low Temp: 41.6 F Cooling DD: 967 Heating DD: 5736 Days above 90 (T090): 15.5 Days above 100 (T100): 0.1 Days below 0 (T000): 3.7 Days below 32 (T032): 124.0 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.38 2.18 2.59 3.67 4.50 4.44 4.34 3.06 2.61 3.25 3.60 3.15 Snow: 5.9 3.1 1.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.3 Number of Days P001: 7.4 6.9 7.9 8.8 10.8 9.8 7.9 6.5 6.4 7.3 7.6 7.8 P010: 4.9 4.7 5.6 7.0 7.7 7.8 6.1 4.6 4.5 5.1 5.3 5.4 P100: 0.6 0.4 0.5 1.0 1.0 1.7 1.2 1.0 0.8 1.1 0.8 0.7 S001: 3.3 2.3 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.8 S010: 2.1 1.4 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.1 S100: 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 39.77 inches Snowfall: 13.7 inches Days precipitation at or above 0 inches (P000): 95.1 Days precipitation at or above 0.10 inches (P010): 68.7 Days Precipitation at or above 1.00 inches (P100): 10.8 Days Snowfall at or above 0.1 inches (S001): 8.4 Days Snowfall at or above 1.0 inches (S010): 5.3 Days Snowfall at or above 10.0 inches (S100): 0.1 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ KEY: High - average daily high temperature, degrees F Mean - average daily mean temperature, degrees F Low - average daily low temperature, degrees F CDD - cooling degree days, base 50F HDD - heating degree days, base 50F T090 - number of Days with Temperatures above 90 degrees F T100 - number of Days with Temperatures above 100 degrees F T000 - number of Days with Temperatures below 0 degrees F T032 - number of Days with Temperatures below 32 degrees F Prcp - precipitation, inches Snow - snowfall, inches P001 - number of Days with Precipitation of 0.01 inches or more P010 - number of Days with Precipitation of 0.10 inches or more P100 - number of Days with Precipitation of 1.00 inches or more S001 - number of Days with Snowfall of 0.1 inches or more S010 - number of Days with Snowfall of 1.0 inches or more S100 - number of Days with Snowfall of 10.0 inches or more Page Source: Dr. Jim Angel, State Climatologist Illinois State Water Survey Prairie Research Institute University of Illinois Data Source: NOAA National Climatic Data Center